Tesla shares held on to an advance immediately after the news, but soon gave up such gains and were recently down 0.2% at $204.14. The stock is down 1.3% so far this month and has slid 15% in the last three months, but has more than doubled in the past 12 months.

Tesla and other companies making electric cars will benefit from a “common, rapidly evolving technology platform,” Musk added.

“Tesla Motors was created to accelerate the advent of sustainable transport,” Tesla’s CEO Elon Musk wrote in a blog post Thursday. “If we clear a path to the creation of compelling electric vehicles, but then lay intellectual property landmines behind us to inhibit others, we are acting in a manner contrary to that goal.”

Musk had hinted at the patent move late Wednesday, when he tweeted news related to Tesla patents was forthcoming.

At Tesla’s June 3 annual meeting, Musk said he was surprised how few auto makers had built electric cars and added he was planning to do something related to Tesla’s patents.

Earlier on, Tesla’s executive filed for patents out of concern that large car makers would copy the company’s technology and then muscle Tesla out of the market, he wrote in the blog.

“We couldn’t have been more wrong. The unfortunate reality is the opposite: electric car programs (or programs for any vehicle that doesn’t burn hydrocarbons) at the major manufacturers are small to non-existent, constituting an average of far less than 1% of their total vehicle sales,” Musk said.

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